Service manual

Wells-Garnder Color Vector Monitor Guide
Page 48 of 73
FIRST HALF
Take the anode ends (the ends opposite from the marked rings) of a 1N914 and a 1N4737, and
solder them to one end of a 1K-ohm resistor so that it looks like this:
ANODE +------+-+ CATHODE
+--------+1N4737| +--------+ GROUND
CATHODE +-+------+ ANODE / +------+-+ |
--------+ | 1N914+--------+ === C700
R700 +-+------+ \ +--------+ |
+--------+ 1K ohm +--------+ -27 VOLTS
+--------+
Locate C700 in the top left of the monitor deflection board. (See Figure 13 on page 20 of Atari
TM-183 Wells-Gardner Quadrascan service manual; second printing) and solder the cathode of
the 1N4737 to the ground side of C700 (right side in Figure 13). Solder the end of the 1K-OHM
resistor to the -27 volt side (left side) of C700. Solder the one remaining wire (the cathode of
1N914) to the "X" INput side of R700 (top end of R700). You are now halfway finished.
HALF TIME
Take a five-minute break; you deserve it.
SECOND HALF
Take the remaining 1N914 and 1N7437, and solder the cathode ends of each diode together with
one end of the 1K-OHM resistor so it looks like this:
ANODE +------+-+ CATHODE
GROUND +--------+1N4737| +--------+
| +------+-+ \ CATHODE +-+------+ ANODE
C701 === +--------+ | 1N914+--------
| +--------+ / +-+------+ R700
+27 VOLTS +--------+ 1K ohm +--------+
+--------+
Locate C701 (top middle in Figure 13) and solder the anode of 1N4737 to the ground side of
C701 (right side). Solder the end of the 1K-OHM resistor to the +27 volt side of C701 (left side).
Go back to the same "X" INput side of R700 and solder the remaining wire (the anode of the
1N914) to this connection. Make sure that you have a good solder connection at the "X" INput of
R700 as you now have a three-wire joint.